code: def test_class_getitem_format(self):
      class C:
          def __class_getitem__(cls, item):
              return f"C[{item.__name__}]"
  
      self.assertEqual(C[int], "C[int]")
      self.assertEqual(C[C], "C[C]")
  
imports: import unittest
  from test import support
label_desc: Use image node_id 2 for calling the TestClassGetitem obj's underlying member method code with example usage: obj.test_class_getitem_format() and returns: str, item, str